Molecular mechanisms & clinical consequences. of prothrombin mutations. A.J. Hauer
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1 Molecular mechanisms & clinical consequences of prothrombin mutations A.J. Hauer
2 Prothrombin & the coagulation cascade Coagulation factor II, thrombin. Prothrombin is synthesized in the liver as inactive zymogen. Activation to thrombin by factor Xa (cofactor Va & calcium). Thrombin converts fibrinogen to fibrin à clot formation. Thrombin also inhibits coagulation by activating protein C.
3 The discovery of 20210G>A, and its (genetic) epidemiology (1996) Sequencing (PCR) the prothrombin (F2) gene of 28 probands from families with unexplained familial thrombophilia: 5/28 vs. 1/100 of healthy controls showed sequence variation (20210G>A) in the 3 untranslated region (3'-UTR) of the cdna just before the poly(a) tail. Subsequent confirmation in a large population-based case-control study: 20210G>A was found in 1 2% of healthy controls, 6.2% of consecutive patients with a first deep venous thrombosis (DVT), and in 18% of patients that had been selected for unexplained familial thrombophilia. Association of 20210G>A with an increased risk of a first DVT (OR: 2.8; 95% CI, ). 2 nd most common prothrombotic mutation (after Factor V Leiden). Overall prevalence 20210G>A: 2.0%. Southern > northern Europe (3.0% vs. 1.7%). Very rare in non-caucasians. Analyses of linkage disequilibria à founder mutation approximately years ago. The Hardy Weinberg equilibrium estimates homozygosity for G20210A in 4 in individuals.
4 Genetic & molecular mechanisms Prothromin (F2) gene: spanning 21kb, containing 14 exons, located on 11p11.2. G20210G/A à rs (SNP ID) The G20210A polymorphism in the 3'-UTR of the F2 gene à efficiency of 3 end processing à concomitant mrna accumulation and protein synthesis à thrombophilic gain-of-function mutations G>A à 30% higher plasma concentrations of functionally normal prothrombin à hypercoagulability? (Virchow's triad) Elevated prothrombin levels may inhibit factor Va inactivation by activated protein C (APC) à thus inducing APC resistance. Additional mutational vulnerability within the 3 flanking sequence? à e.g. the C20209T polymorphism.
5 Clinical consequences venous thrombosis Most G20210A carriers remain asymptomatic for their lifetime! Incidence of VTE in heterozygotes: /100 person-years (2- to 7-fold risk of VTE). G20210A & Factor V Leiden: 20-fold risk of VTE compared to individuals with neither mutation. Interactions with other genetic & acquired risk factors à important determinants of the overall risk of VTE, e.g. use of oral contraceptives à up to 16-fold risk of VTE. ClinVar : à G20210A pathogenic for venous thromboembolism (VTE) Meta-analysis of 15 studies (776 cases; controls): 20210G>A à risk of cerebral sinus thrombosis (OR: 6.05; 95% CI, , I2 = 5%; p = 0.39).
6 Clinical consequences arterial thrombosis? 20210G>A à no substantial risk of arterial thromboembolism (ATE): à associations with coronary artery disease (CAD) and ischaemic stroke (IS) only modest (much weaker than with VTE) or absent. Low cumulative incidence of ATE in asymptomatic 20210A carriers, and in those with prior VTE. Synergistic interaction with traditional CV risk factors? à Smoking?! (by itself prothrombotic) Genome-wide association studies (GWAS) of CAD and IS (subtypes): rs not significant (thus far). Lack of power? à limited sample size, effect size, not tagged/limited LD, low minor allele frequency. Cross-phenotyping of GWAS à possible association of rs with peripheral artery disease (of note: lead SNP à mostly not causal).
7 References Poort SR, Rosendaal FR, Reitsma PH, Bertina RM. A common genetic variation in the 3'-untranslated region of the prothrombin gene is associated with elevated plasma prothrombin levels and an increase in venous thrombosis. Blood. 1996;88: Rosendaal FR, Doggen CJ, Zivelin A, et al. Geographic distribution of the G to A prothrombin variant. Thromb Haemost. 1998;79: Zivelin A, Mor-Cohen R, Kovalsky V, et al. Prothrombin 20210G>A is an ancestral prothrombotic mutation that occurred in whites approximately 24,000 years ago. Blood. 2006;107: Reitsma PH, van de Stolpe A. From gene to disease; risk factors for venous thrombosis: factor V Leiden and prothrombin 20210A. Ned Tijdschr Geneeskd. 2001;145: Gehring NH, Frede U, Neu-Yilik G, et al. Increased efficiency of mrna 3' end formation: a new genetic mechanism contributing to hereditary thrombophilia. Nat Genet. 2001;28: Danckwardt S, Gehring NH, Neu-Yilik G, et al. The prothrombin 3'end formation signal reveals a unique architecture that is sensitive to thrombophilic gain-of-function mutations. Blood. 2004;104: Danckwardt S, Hartmann K, Gehring NH, Hentze MW, Kulozik AE. 3' end processing of the prothrombin mrna in thrombophilia. Acta Haematol. 2006;115: Smirnov MD, Safa O, Esmon NL, Esmon CT. Inhibition of activated protein C anticoagulant activity by prothrombin. Blood. 1999;94: Soria JM, Almasy L, Souto JC, et al. J. Linkage analysis demonstrates that the prothrombin G20210A mutation jointly influences plasma prothrombin levels and risk of thrombosis. Blood. 2000;95: Wolberg AS, Rosendaal FR, Weitz JI, et al. Venous thrombosis. Nat Rev Dis Primers. 2015;1: Martinelli I, De Stefano V, Mannucci PM. Inherited risk factors for venous thromboembolism. Nat Rev Cardiol. 2014;11: Lauw M, Barco S, Coutinho J, Middeldorp S. Cerebral venous thrombosis and thrombophilia: a systematic review and metaanalysis. Semin Thromb Hemost. 2013;39: Bank I, Libourel EJ, Middeldorp S, et al. Prothrombin 20210A mutation: a mild risk factor for venous thromboembolism but not for arterial thrombotic disease and pregnancy-related complications in a family study. Arch Intern Med. 2004;164: Coppens M, van de Poel MH, Bank I, et al. A prospective cohort study on the absolute incidence of venous thromboembolism and arterial cardiovascular disease in asymptomatic carriers of the prothrombin 20210A mutation. Blood. 2006;108: Boekholdt SM, Kramer MH. Arterial Thrombosis and the Role of Thrombophilia. Semin Thromb Hemost. 2007;33: Mahmoodi BK, Veeger NJ, Middeldorp S, et al. Interaction of Hereditary Thrombophilia and Traditional Cardiovascular Risk Factors on the Risk of Arterial Thromboembolism: Pooled Analysis of Four Family Cohort Studies. Circ Cardiovasc Genet. 2016;9: Krajcoviechova A, Wohlfahrt P, Mayer O Jr, et al. Tobacco smoking strongly modifies the association of prothrombin G20210A with undetermined stroke: consecutive survivors and population-based controls. Atherosclerosis. 2015;240: Majumdar A, Haldar T, Bhattacharya S, Witte JS. An efficient Bayesian meta-analysis approach for studying cross-phenotype genetic associations. PLoS Genet. 2018;14:e
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